Charles w



c. w. DAKE.

SAFETY DEVICE FOR STEAM TURBINES.

APPLICATION FILED SEPT- 2. I920- Patented Oct. 31, 1922.

Java nt r V C76 7 266 ZflDebZ'e 71/2! fine/ 7 N W- 57% 1 6; Ziornegf Patented Oct. 31 1922.

UNITED STATES PATENT OFFICE.

CHARLES W. DAKE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE PYLE-NATIONAL COM- PAN'Y, OF CHICAGO, ILLINOIS, A CORPORATION OFNEW JERSEY.

SAFETY DEVICE FOR STEAM TURBINES.

Application filed Septemher 2, 1920. Serial No. 407,621.

Fig. 2 is a cross section on line 22 of Fig. 3 is a cross section on the line 3-3 of Fig. 1;

Like parts are indicated by like characters throughout.

A is a collar or hub of the rotor wheel of the steam turbine.

roove A. Within this groove is pivoted t e weight B shaped as shown. It has secured to it the fiat sprin C. A screw C is mounted in the weight and bears against the spring C to determine its effective action. It serves also to ad'ust the tension of the spring. The spring bears against the bottom of the groove A or in the absence of such groove upon the hub AL D is a rock lever pivoted in the turbine assembly having the free end D adjacent the hub A and the notched end D normally contacting with one end of the cut off E. D is a. spring se cured at one end to the cut off E and at the other end with a rock lever D. F is a portion of the periphery of the rotor. FF' are buckets secured in the periphery of the rotor. G is a steam passage or conduit whioh leads steam from any suitable generating source through the part G into the nozzle G from which it is discharged against the buckets F'F. On the inner end of the cut. ofi E is located the head E. The journal as at E is supported from any suitable source within the turbine assembly. It has the lateral projection E which lies with in and forms one wall of the forward portion of the nozzle. Y

The use and operation of this invention areas follows:

When the rotation of the rotor exceeds a predetermined rate, then the weight flies out from the hub and strikes the free end Preferably it has a.

of the rock lever, which normally-locks the cut off in open position. When the weight strikes this lever it forces it down and thus disengages the end of the cut off and the spring at once rocks the cut off to force its head into the nozzle through which steam is discharged against the buckets. Unless the near end of the cut oil has at one end projections in front of the nozzle its action is facilitated by the impact of the steam on the concave end of the cut off head which in that position will be at one side of the line between the pivotal point of the cut off and the point where the steam enters.

The collar of the cut ofi near the spring acts as a stop against the body portion of the nozzle to limit the spring actuated travel of the cut off. The arrangement of parts is such that the downward movement of the cut ofl cannot cause any portion of it to project into the path of the buckets.

AlthoughI have shown in my drawings an operative form of my invention, still it will be obvious that many changes might be made both in size shape and arrangement of the parts without departin' materially from the spirit of my invention.

I claim:

1. In a turbine a rotor, a. nozzle, a cut off adapted to move into said nozzle and means operated responsively to the rotation of said rotor to cause said out off to move into said nozzle, said means including a member adapted to hold the cut off normally in inoperative position, means for releasing it, and yielding means for moving the cut off into operative position when released.

2. Ina turbine a rotor, a nozzle, a cut off adapted to move into said nozzle and means operated responsively to the speed of rotation of said rotor to cause said out off to move into said nozzle, said means including a member adapted to hold the cut off normally in inoperative position, means for releasing .it, and yielding means for moving the cut off into operative position when re leased.

3. In a turbine a rotor, a nozzle, a cut off adapted to move into said nozzle and means operated responsively to the rotation of said rotor to cause said cut off to move into said nozzle and a stop to limit the inward motion of said out oflf, said means including a member adapted. to hold the cut oil normally in inoperative position, means for re leasing it, and yielding means for moving the cut off into operative position when released.

l. In a turbine a rotor, a nozzle, a cut off adapted to move into said nozzle and means operated responsiv'ely to the rotation of said rotor to cause said cut off to move into said nozzle, said means including a member adapted to hold the cut ofl normally in inoperative position, means for releasing it, and yielding means for moving the out oft" into operative position when released, said cut off adapted. when its inward motion has been initiated by said spring to be moved by the impingement of steam upon it.

5. In turbine a rotor, a nozzle, a cut ofii adapted to move into said nozzle and means operated responsively to the speed of rotation of said rotor to cause said cut oil to move into said nozzle, said means including a member adapted to hold the cut off normally in inoperative position, means for releasing it, and yielding means for moving the out off into operativeposition when released, said cut off adapted, when *its inward motion has been initiated by said spring to be moved by the impingement of steam upon it.

6. In a turbine a rotor, a nozzle, a cut off adapted to move into said nozzle and means operated responsively to the rotation of said rotor to cause said out off to move into said nozzle and a stop to limit the inward motion of said cut oil, said means including member adapted to hold the cut oil normally 1n inoperative position, means tor releasing it, and yielding means for moving the cut oil into operative position when released, said out off adapted, when its inward motion has been initiated by said spring to be moved by the impingement of steam upon it. t

7. In a turbine, a rotor and a nozzle, a cut oil normally forming a part of the an of said nozzle and out of the line of passage oithe steam and adapted to move into's'aid nozzle and aorosssaid line of passage and means operated responsively to the rotation of said rotor to cause said out off to close said nozzle.

8. In a turbine a rotor and a nozzle, a cut oil normallv adjacent to and forming a part of said nozzle, saidcut olf-adapted to move into saidnozzle but normally held out of it, means for releasing rsaid cut off and yielding means adapted to move-it when released across the nozzle passage, said releasing means adapted to operate in response to a predetermined rate of rotation of the rotor.

9. A safety device for steam turbines comprising a weight pivoted upon the rotor of the turbine and adapted to move with relation thereto a nozzle in said turbineand a out off pivoted in said turhine normally forming a continuation of said nozzle and adapted to rotate across said nozzle, means for holding said cut off out oi said nozzle and separate means operated responsivelv to the rotation of saidv weight adapted to move said cut off into said nozzle.

10. A safety device for steam turbines comprising a weight pivoted upon the rotor of the turbine and adapted to move with relation thereto, a nozzle in said turbine and a cut off pivoted in said turbine normally forming a part oil: and adapted to be rotated into said nozzle, a rock lever adapted to hold said cut oil out of said nozzle and.

- adapted to be tripped by contact with said weight.

11. A. safety device for steamturbines comprising a weight pivoted upon the rotor of the turbine and adapted to move with relation thereto, a nozzle in said turbine and a cut off pivoted in said turbine normally forming a part of and adapted to be rotated into said nozzle, a rocklever adapted to hold said out off out of said nozzle and adapted to be tripped by contact with said weight, and a spring adapted to move said cut oil into said nozzle.

12. A safety device for steam turbines comprising a weight pivoted upon the rotor of the turbine and adapted to move with relation thereto, an adjustable spring upon said weight and adapted to resist said motion, a nozzle in said turbine and a cut of? pivoted in said turbine normally forming a part of and adapted to be rotated into said nozzle, :1 rock lever adapted to hold said out off out of said. nozzle and adapted to be out of line with the jet of steam, the obstructi'ng means being arranged when once lnposltion so that the pressure of the steam et tends to holdsuch means 111 obstructing position.

14. In a steam turbine a rotor and means for discharging a jet of steam thereagainst to rotate it, and means operative responsively to the rotation of the rotor to obstruct the .jet of steam as it passes thereto, and a stop to limit the movement ofsuch. obstructing means, said obstructing means being normally held out of line with the jet of steam, the obstructing means being arranged when once in. position so that the pressure of the steam et tends to hold such means in obstructing position.

15. In a steam turbine a rotor and means for discharging a jet of steam thereagainst to rotate it, and means operative responsively to the rotation of the rotor to ob struct the jet of steam as it passes thereto, said obstructing means being normally held out of line witli the et of steam. but adapted when the speed exceeds a predetern'iined limit. to be thrust into line therewith, the obstructing means being arranged. when once in position so that the pressure of the steam tends to hold such means in ob structing position.

16. In a steam turbine a rotor and means for discharging a jet of steam thereagainst to rotate it, and means operative .respon sively to the rotation 01 the rotor to ob struct the jet of steam as it passes thereto, and a stop to limit the movement of such obstructing means, said obstructing means being normally held out of line With the jet of steam, but adapted When the speed exceeds a predetermined limit to be thrust into line therewith. the obstructing means being arranged when once in position so that the pressure of the steam jet tends to hold. such means in obstructing position.

17. In a turbine, a rotor and a nozzle, a cut off member normally out of line With the nozzle passage, means tending to hold it in inoperative position, means responsive to the rotation of the rotor to release the cut off and yielding means adapted to move it When released across the path of the nozzle.

18. A turbine, a rotor and a nozzle adapted to discharge a jet of steam into said rotor, a cut-off element adapted to be moved across the path of said jet and means responsive to the rotation of the rotor to cause said cutofl so to move.

19. A turbine, a. rotor and a nozzle adapted to discharge a jet of steam into said rotor, a cut'ofi element 'positioned adjacent the path of said jet and means for normally holding it out of said. path and means responsi": to the rotation of the rotor for permit it to move across said path.

In a turbine, a rotor, a nozzle adapted to direct a jet of steam into said rotor, a cutotl elementlying beyond the end of said nozzle, and means operated in response to the rotation of the rotor for causing said cut-off element to move across the nozzle opening.

21. In. a turbine, a rotor, a. nozzle adapted to direct a jet o't team into said rotor, a cutoii element lying beyond. the end of said nozzle, and means operated in response to the rotation of the rotor for causing said out ell element to move across the nozzle opening, and means for limiting the travel of said cutoff element across said nozzle opening.

22. In a. turbine, a rotor, a nozzle adapted to direct a jet of steam into said rotor, a cut-off element lying beyond the end of said nozzle, and means operated in response to the rotation of the rotor for causing said cut-off element to move across the nozzle opening, said. cut-off element being pivoted adjacent the line of passage of the rotor buckets, and means for limiting its travel across the nozzle opening in the direction of said buckets.

Ir a turbine, a rotor, a nozzle, a cut oil adapted to move across said nozzle, and

means operated in response to the rotation of said rotor to cause said cut-off to move across said nozzle.

Tn a turbine, a rotor, a nozzle, a cutoil adapted to move across the delivering end oi said nozzle and means operated in response to the rotation of said rotor to cause said cut-off to move across the delivering end of said nozzle.

Signed at Chicago, county of Cook, and State of Illinois, this 30th day of August, 1920.

CHARLES W. DAKE. 

